Mill pick



Oct. 10, 1939.

S. O. MONTAGUE MILL PICK Filed Aug. 11, 1937 I um- Patented Oct. 10, 1939 UNITED STATES PATENT OFFIQE 1 Claim.

The present invention relates to improvements in stone dressing implements, and in particular to that type generally known as mill picks for dressing grinding stones.

It is a customary procedure on the part of millers to dress the grinding surfaces of the mill stones once or more times a week, and for this purpose a tool having a sharpened picking element is employed. These tools become quickly dulled, necessitating sharpening thereof at frequent intervals.

The process generally followed heretofore involves the annealing, pointing and re-tempering of the implement, a process which involves relatively high expense.

Further, a single pointed instrument of this character makes the process of dressing stones a slow one at best.

It is, therefore, the primary object of these improvements to provide a special construction of tool in which a relatively large number of picking elements are removably disposed in a group in the head of the implement and in cross rows so arranged that at each blow of the implement a large number of pits or recesses are produced in the face of the stone at uniform intervals.

By virtue of the particular construction of the picking body and the mounting of the individual picking elements, numerous advantages are obtained, among which may be included the increased speed in dressing with reduction of labor, uniformity of dressing, ready adjustment of the bits, and material facility of the sharpening process by the use of special steel for the bit members.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claim.

In the drawing:

Fig. 1 is a perspective embodying my invention;

Fig. 2 is a vertical sectional view thereof; and

Fig. 3 is a vertical sectional View on the plane indicated by the line 33 of Fig. 2.

Like reference characters designate corresponding parts in the several figures of the drawmg.

Referring to the drawing and specifically de scribing the invention, I designates the elongated socket head of the implement which is provided centrally with the usual handle eye 2 to receive the handle 3. This body member is transversely grooved at each end so as to form open View of an implement stood that the sockets ended sockets 4 when opposed clamping plates 5 are connected to the head, as by means of the bolts 6. These sockets are rectanglar in shape and are adapted to receive a group of correspondingly shaped bits or picking members. 5

It will be noted in Fig. 1 that each of the bits 1 is square shaped in cross section and dressed at one end into a pyramidal shaped point. By arranging these bits in intersecting rows, a series of pits may be produced at each blow of the imple- 10 ment.

I prefer to use what is generally termed selfhardening or self-tempering steel for these bitsa steel that does not require special tempering treatment for the purposes of sharpening. The 15 material is, furthermore, very hard and therefore long lasting in use. With this type of material, when it is necessary to sharpen the bits, this operation is easily accomplished by pointing them on an ordinary emery stone.

It will be noted that these bits are held in their respective sockets only by the clamping plates 5 which extend from one end of the body to the other to form common clamping means for both of the sockets. 25

To insure sufficient clamping stress or pressure upon the individual bits, I prefer to insert a resilient strip or gasket 8 of rubber between one of the clamping plates and the head so as to extend along one side of the bits in the respective sockets. 30 In this way the uneven surface produced by the grouping of the bits is accommodated by the rubber and sufiicient pressure exerted by the clamping plate will hold each of the bits in its proper position. 35

The particular form of the head member is advantageous in that the grooving of the end for forming the sockets may be produced by the customary method of milling, but it will be undermay be formed by any other process if preferred.

Owing to the arrangement of the individual bits, it is only necessary to group. them in their intersecting rows and by resting the points upon a surface they may be easily adjusted and clamped so that the points will lie in a horizontal plane. This arrangement eliminates the necessity of passing fastening devices through the bits, under which conditions the adjustment of the same is rarely uniform.

After the bits wear down and become shorter from the re-sharpening process during the course of time, metal spacers 1' may be placed in the bottom of the socket, as shown in Fig. 2, to arrange the bits in their normal extended position.

It is desirable in implements of this character to provide each end of the head with a corresponding set of picking implements. However, instead of providing both sockets of the head with the face dressing implements or bits I, one set of these bits Ta may be formed for furring purposes. In the construction of the furring bit, however, only two sides of the tip are dressed or pointed so that when the bits are arranged in their operative position, each row of bits will form an elongated blade or cutting edge 11).

It will be understood from the foregoing that in either case double sets of the bits of corresponding form may be utilized in this implement and I do not wish to be restricted to the particular form employed.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

A mill pick comprising a doub1e-ended body having an intermediate handle eye and an opensided recess at each end of the body extending at right angles to the axis of the handle eye, a pair of complemental clamping plates extending to the opposite ends of the body at opposite sides thereof for closing the side openings of the recesses, a pair of clamping bolts extending through the body and the said plates at right angles to the axis of the handle eye for clamping the plates to the opposite sides of the body, mill pick members arranged in the recesses in intersecting rows between the clamping plates and the sides of the recesses, and resilient packing means between the mill pick members and the interior of each recess tensioned by the clamping plates to retain the pick members in said recesses.

SAMUEL O. MONTAGUE. 

